budget = float(input())
product = input()
counter = 0
sum = 0

while product != 'Stop':
    price = float(input())
    counter += 1
    if counter % 3 == 0:
        budget -= price / 2
        sum += price / 2
    else:
        sum += price

    if sum > budget:
        print("You don't have enough money!")
        needed_money = sum - budget
        print(f'You need {needed_money:.2f} leva!')
        break
    product = input()
else:
    print(f'You bought {counter} products for {sum:.2f} leva.')